1. BEVERIDGE, W.I.B. & BURNET, F.M. Med. Res. Council Spec. Rept. Sci. 256, 1946.
2. HADORN, E. Adv. Genet. 4:53, 1951.
3. HADORN, E. “Developmental Genetics and Lethal Factors”, p. 118, Methuen, London, 1961.
4. CAMPBELL, A. Virology 14:22, 1961.
5. EPSTEIN, R.H., BOLLE, A., STEINBERG, C.M., KELLENBERGER, E. ET AL. Cold Spring Harbor Symp. Quant. Biol. 28:375, 1963.